Clutch for a pneumatic hammer.



S. OLDHAM.

'CLUTCH FOR A PNEUMATIC HAMMER. APPLICATION FIILED DEC.3I, 1914.

Patented June 1, 1915.

MTORWEY$ In practice, the split collet is placed in the socket together with the rivet-set, so that said collet is confined in the socket and its interior rib engages the annular recess and admits of the set having limited longitudi nal play within the collet but being retained by the collet from passing out through the opening in the bottom of the socket. The barrel of'the tool is now inserted between the arms with its end bearing in the socket and against the upper edge of the split ring, and the bail is placed to straddle the handle socket and enter the ears of the bars, whereupon the coiled springs and the thumb-nuts are placed upon the screw-threaded legs of the bail. When the tool is started and its piston imparts blows upon the shank of the set, such blows will drive the set down freely, as longitudinal play is-provided by the annular recess of the set upon the internal rib of the split collet, and the downstroke of the set will be absorbed by the split-collet and socket cushioning on the spring-coils, thus modifying the recoil of the stroke. The lugs on the thumb-nuts and ears and the notches in the endsof the coiled springs will prevent the springs and nuts from turning on the threaded legs of the bail.

This safety attachment for the rivet-set is adapted for-use with the usual riveting tools and rivet-sets, without necessitating any changes in these elements, and accidents and loss from the sets and pistons being shot out of the hammer are prevented.

If the rivet-set has only one peripheral rib, 25, at the upper end of its head instead of the peripheral recess, as is desirable in small sized sets, a solid locking-collet can be used instead of a split collet, and the set is then dropped through the collet at the upper end of the same, when the set," collet and lower end the barrel is inserted in the socket in the same manner as in the firstdescribed device, and will perform the same function as said device.

Other modes of applying the principle of my invention may be employed for the mode herein explained. Change may therefore he made as regards the mechanism thus disclosed, provided the principles of construction set forth, respectiv ly, in the following claims are employed.

' Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a clutch for a pneumatic hammer, an open socket adapted to movably fit upon the lower end of the hammer-barrel and having an annular flange in its bottom opening, a bail adaptedto straddle the end of the handle-socket, yielding connections between the legs of the bail and the socket, and a split collet adapted to slidingly fit in the socket and adapted to engage a rivet-set to have limited longitudinal play within it.

2. In a clutch for a pneumatic hammer, an open socket adapted to movably fit upon the lower end of a hammer-barrel and havin bars adapted to bear against the sides of the latter and said open socket having an annular flange, a bail adapted to straddle the handle-socket, expanding and contractible connections between the legs of the bail and the bars of the socket, and a s lit collet adapted to slidingly fit in the soc et and to receive a rivet-set having limited longitudinal play in the same.

3. In a clutch for a pneumatic hammer, an open-ended socket adapted to movably fit upon the lower end of a hammer-barrel and formed with means for supporting a rivetset longitudinally movable therein and upwardly extending bars adapted to bear against the sides of the barrel and formed with perforated cars at their upper ends, a bail adapted to straddle the handle-socket of the hammer and having screw-threaded legs projecting through said ears, nuts upon said screw-threaded legs, and coil-springs upon said legs and'bearing against said ears and nuts.

4. A pneumatic percussion tool and a rivet-set having a shank fitting in the barrel of the tool and having a wide peripheral rc cess, a socket having an open bottom formed with an annular flange and. adapted to movably fit upon the lower and oi? the tool-barrel and provided with bars adrpted to extend upward along the sides of the barrel and formed with perforated ears at their upper ends, a bail straddling the handle socket and having screwthreaded legs projecting through said ears, nuts upon said threaded legs, coil-springs upon said legs between the ears and nuts, and a split collet movable within the socket and formed with an interior flange movable in the recess of the rivet set.

ln a clutch for a pneumatic hammer, an open socket adapted. to movubly fit upon the lower end of the hammer-barrel and having an annular flange in its bottom opening, a bail adapted to straddle the end of the handle-socket, yielding connections between the legs of the bail and the socket, and a collet adapted to slidingly fit in the socket and adapted to engage a rivet-set to have limited longitudinal play Within it 6. In a clutch for a pneumatic hammer, an open socket adapted to slidably fit upon the lower end of a hammer-barrel, expansible and contractible means adapted to pass around the upper end of the barrel and secured to said socket, a rivet-set having an said rib and limitedly longitudinally movable in the socket.

SAMUEL ()LDHAM.

Witnesses:

C. D. MGVAY, K. M. BROPHY.

flames at. this patent may be obtained for five cents each, by addressing the Commissioner of Patenta,

Washington, D. U. 

